/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.volley.toolbox;

import com.android.volley.NetworkResponse;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.Response.ErrorListener;
import com.android.volley.Response.Listener;

import java.io.UnsupportedEncodingException;

/**
 * A canned request for retrieving the response body at a given URL as a String.
 */
public class StringRequest extends Request< String >
{
	private Listener< String > mListener;
	
	/**
	 * Creates a new request with the given method.
	 * @param method the request {@link Method} to use
	 * @param url URL to fetch the string at
	 * @param listener Listener to receive the String response
	 * @param errorListener Error listener, or null to ignore errors
	 */
	public StringRequest(
			int method,
			String url,
			Listener< String > listener,
			ErrorListener errorListener )
	{
		super( method, url, errorListener );
		mListener = listener;
	}
	
	/**
	 * Creates a new GET request.
	 * @param url URL to fetch the string at
	 * @param listener Listener to receive the String response
	 * @param errorListener Error listener, or null to ignore errors
	 */
	public StringRequest(
			String url,
			Listener< String > listener,
			ErrorListener errorListener )
	{
		this( Method.GET, url, listener, errorListener );
	}
	
	@Override
	protected void onFinish()
	{
		super.onFinish();
		mListener = null;
	}
	
	@Override
	protected void deliverResponse( String response )
	{
		if( mListener != null )
		{
			mListener.onResponse( response );
		}
	}
	
	@Override
	protected Response< String > parseNetworkResponse( NetworkResponse response )
	{
		String parsed;
		try
		{
			parsed = new String( response.data, HttpHeaderParser.parseCharset( response.headers ) );
		}
		catch( UnsupportedEncodingException e )
		{
			parsed = new String( response.data );
		}
		return Response.success( parsed, HttpHeaderParser.parseCacheHeaders( response ) );
	}
}
